US3149662A

US3149662A - Augmented air supply

Info

Publication number: US3149662A
Application number: US189916A
Authority: US
Inventors: William R Irwin
Original assignee: Individual
Current assignee: Individual
Priority date: 1962-04-24
Filing date: 1962-04-24
Publication date: 1964-09-22
Anticipated expiration: 1981-09-22

Description

Sept. 22, 1964 w. R. IRWIN AUGMENTED AIR SUPPLY 4 Sheets-Sheet 1 Filed April 24, 1962 R E L O B TO IGNITION TRANSFORMER (NOT SHOWN) INVENTOR.

WILLIAM R. IRWIN S ept. 22, 1964 4 Sheets-Sheet 2 Filed April 24, 1962 FIREBOX TO ELECTRIC RELAY TANK TO ELECTRIC RELAY INVENTOR. WILLIAM R. IRWIN Sept. 2.2, 1964" w. R. IRWIN AUGMENTED AIR SUPPLY 7 Filed April 24, 1962 INVENTOR. WILLIAM R. IRWIN 4 Sheets-Sheet 3 TO POWER LINE T0 POWER LINE T0 POWER LINE Sept. 22, 1964 w. R. IRWIN AUGMENTED AIR SUPPLY Filed April 24, 1962 CONDUIT 23b FUEL UNIT 4 Sheets-Sheet 4 INVENTOR. WILLIAM R. IRWIN United States Patent 3,149,662 AUGMENTED AIR SUPPLY William R. Irwin, R0. Box 155, Blvd. Station,

Bronx 59, N.Y. Filed Apr. 24, 1962, Ser. No. 189,916 28 Claims. (Cl. 158-28) This invention relates primarily to air supply means and secondarily to use of such means whereby air at a plurality of separately defined rates is applied to support combustion of fuel at a plurality of separately defined rates.

The present application is a continuation in part of my prior application Serial No. 803,023, filed March 30, 1959, and now abandoned.

One of the objects of the invention is to provide novel arrangements of a plurality of blowers or fans whereby air is supplied under pressure at one or more rates in accordance with the number of individual blowers employed.

Another object is to provide means whereby an operating blower or fan may be used to maintain ambient air at certain standards desired for comfort.

Other objects and advantages will become apparent hereinafter.

In carrying out my invention in one form I provide a fuel burning apparatus comprising an oil burner, means for variably firing same and control means applied to said firing means.

In carrying out my invention in another form I provide a fuel burning apparatus which differs from the aforesaid in some respects but which illustrates how structure may be varied without departing from the main inventive concept.

In each apparatus a blower plurality is employed and in conjunction therewith means are provided to control the air intake rate and the air output rate of an associated individual blower or the air intake and output rates of an associated plurality of blowers.

In each apparatus a solenoid operated flow control valve is utilized which directs fuel flow through a channel to an area where the rate of fuel provided is synchronized with the proper rate of air necessary to support correct combustion of said fuel.

Air intake regulating means are provided for predetermination of the time air is to be admitted to the intake side of an individual blower and for the amount or rate of air that is to be admitted.

For a better understanding of the invention reference should be had to the drawings in which:

FIG. 1 is a view, generally diagrammatic, of an embodiment of the invention encompassing an oil burner. shown partly cut away, with an air supply system, fuel supply system and an electrical control system;

FIG. 2 is a perspective view of an air intake louver operative by the negative air pressure induced by a blower;

FIG. 3 is a diagrammatic view of another embodiment of an oil burning apparatus;

FIGS. 4, 5 and 6 are sectional views of part of a motorblower shaft with adjuncts, taken after previous inventions and with modifications imposed thereon, showing components at different stages of operation;

FIG. 7 is a diagrammatic view of a fuel unit comprising oil pumping means, filter means, bypass means and pressure regulating means;

22 from where it would again be drawn to the pumping FIG. 8 is a diagrammatic, sectional view of an oil flow,

3,149,652 Patented Sept. 22., 1964 "ice with a compartment for two fans 11 and 12 which are Welded together at a medianly situated closed plate 13.

At said closed plate formed by the juncture of the fans, a flange 14 is formed peripherally thereon. The flange is endless and of exactly the same diameter throughout and rotates in unison with the fans 11 and 12.

Throughout its circumference, the flange is enclosed by the slot 15 with very small tolerance therebetween, the object of running the flange within the slot being to minimize the passage of air from one blower or fan to the other. This feature is not essential to the main concept and numerous other methods are available for obtaining the same result.

A meter 16 when energized turns the fans 11 and 12 by means of the shaft 17 which is supported on one side by the meter bearing 18 and on the other side by the outboard bearing 19. The meter 16 also provides rotation to the gears of a pumping means associated with oil pressure regulating means in a housing 20 and said rotation causes fuel oil to be drawn from a tank 21 into the suction intake of said housing through fuel suction conduit 22.

At this point it might be mentioned, that the embodiments were illustrated diagrammatically for the most part, to show the effect that one element would have on another, and, little effect was made to depict the whole realistically, as with a working drawing. However, in practice there would not be employed, except wih very heavy units of large capacity, an outboard bearing, and, rather than having a pump, fuel oil strainer, oil pressure regulating and oil flow cut-off means in dispersed locations these components would in all probability be incorporated within a unitary device called a fuel unit, most of the elements of which are illustrated in another figure except for cut-off means which are depicted separately. To facilitate understanding, the housing 21) should be considered as.-a fuel unit.

Fuel units have been in existence for some decades, are very compact and inexpensive, and regulate oil pressure and flow with great precision. In practice, fuel units are almost invariably mounted on a sidewall of the burner frame.

In FIG. 1 the ignition means have not been shown completely but they are indicated. In another figure means for lighting off the fuel are illustrated more comprehensively and it is believed that this will sufiice also for an understanding of the first embodiment.

Returning again to the description: The gears of the pumping means at 26 when actuated, discharge oil drawn from the storage tank at a defined rate of pressure through conduit 23 and thence to a solenoid operated, flow regulating valve 24. Excess oil may be pumped back into the storage tank via conduit 9 when the structure 29 is considered to be a fuel unit. If said structure is viewed only as a pumping means, excess oil can be returned to the oil supply tank 21 through conduit section 23a, the valve 25 serving as a pressure regulating valve, at which time the valve 8 emplaced in oil conduit 9,'would be fully closed.

Preferably, and under ordinary circumstances, conduit 9 would be used to return excess oil to the suction conduit means, at which time valve 8 would be opened andvalve 25 would be completely closed.

The solenoid operated, flow regulating valve 24 has one normally opened passageway and one normally closed passageway therethrough. The normally opened passageway leads to oil conduit 26 and calibrated nozzle 27 while the normally closed passageway when opened by effect of electrical energy being applied to the coil 53 thereof, allows oil toflow to conduit 28 and calibrated nozzle 29. Opening of the normally closed passageway of the valve results in the simultaneous closing of the normally opened passageway.

Air to support the oil in combustion is indrawn through the louver blade combinations 3t and 31, said combinations when in their opened positions allowing ambient air to reach the suction sides of the blower means lit and 12 respectively.

The louver blade combination 34 is of a type that immediately swings to the opened position when motor 16 is energized and blower 11 generates on its suction side a pressure below atmospheric.

Louver blade combination 31, although similar in type to the blade combination 30, is held in the closed position by latch 32 of the actuator 33 until the latch is withdrawn when said actuator is electrically energized.

Upon withdrawal of the latch, the blade combination 31 opens in immediate response to the negative air pressure generated by the rotating vanes of the blower means. Air indrawn through either or both of the louver blade combinations 3t} and 31 is discharged at a pressure above atmospheric off the tips of the rotating vanes of the blower means 11 and 12 respectively, into the blast tube 34 from whence it is discharged into a firebox at a defined rate in synchronization with a defined rate of oil discharged from one or the other of the

calibrated nozzles

27 or 29.

Oil is sprayed from the nobbles in what is generally termed a solid or hollow cone form and most fuel oils discharged from a nozzle in such manner and intimately mixed with a proper rate of air are readily ignitable and combustible although some oils must to be preheated before being introduced into a combustion chamber.

When a firebox of correctly balanced proportions is provided with a defined and correct quantity or rate of oil which is supported in combustion by an exact rate of air, the ultimate in efficiency is obtainable insofar as heat unit extraction from the fuel and availability of said heat units for useful purposes may be concerned.

This object is attained with the present invention when the apparatus is employed for the high flame condition. A high degree of efficiency may also be obtained when the apparatus is fired for the low flame condition if the air used to support combustion for a smaller sized flame is rationed with exactitude.

In the drawing the latch 32 is shown as an enlongated component, pressable, in its normal, unactuated position, against the tops of the three blades comprising the louver blade combination 31 to keep the blade plurality in the closed position. The individual blades are pivotally mounted and the upper portions of the blades extend outwardly and their lower edges are pulled inward by negative air pressure generated by the blower means 12 when the wheel of said blower means is rotated upon motor 16 being energized. The said blades are held in the closed position, as indicated, even though the wheel of the blower means is rotating, until latch 32; is withdrawn from its holding position as a result of the actuator 33 being electrically energized. Whilethe means depicted are effective, in actual practice more compact elements are available and would normally be used. In the construction shown, it would suffice if latch 32 pressed against only one of the blade plurality.

The burner and motor units are shown mounted on a base member 35. A boiler is indicated in the drawing and responsive to pressures within the boiler and in con trol thereover are regulating means in the form of

mercury switches

36 and 37. A manually operative switch 38 makes or breaks connection with L, shown as the line source of electrical potential, and an electrical conduit section 39 extends between switch 38 and mercury switch 36. Another conduit section 46 extends between switch 36to an electrical junction 41 and extending between said junction and motor 16 is another conduit section 42. Another electrical junction 43 is emplaced in section 42. and a conduit section 44 is connected thereto which leads to the electrical transformer and ignition 4- means which are indicated, but are not fully depicted in FIG. 1.

A conduit section 45 connects junction 41 with terminal #1 of relay switchboard 46, said relay having a Nichrome type coil 47 which extends between relay terminals #1 and #3. Terminal #3 has a connection leading to ground which is similar to a connection to ground from the negative side of the winding of motor 16.

Pivoted at terminal #1 of the relay switchboard is a contact blade 48 which upon receiving heat generated by coil 4'? warps, after a predetermined interval, to make contact across terminals #1 and #2 thereof. An electrical conduit section 49 extends between terminal #2 and mercury switch 37 and another conduit section 50 extends from switch 37 to a junction 51 and from last said junction a conduit section 52 extends to the coil 53 of the solenoid'operated, flow control valve 24. From the ground side of coil 53 an electrical conduit section 54 extends to a junction 55 from which a conduit section 56 leads to the ground terminal #3 of the relay switchboard. From junction Sll a conduit section 56 leads to the coil of actuator 33 and from the negative side of said coil a conduit section 57 extends to junction 55 which in turn is connected, as said, with conduit section 5%, terminal #3 and ground.

The louver blade combination 31 is shown more clearly in FIG. 2 and it should be understood that said combination is similar to louver blade combination 30 except that some elements of blade combination 31 have been transposed with regards to lateral position.

Various reference numbers indicating elements of combination 30 have letters added thereto to distinguish same from members of the louver blade combination 31.

The three blades (1, b and c of combination 31 are pivotally mounted within a frame 58 with each of said blades having a beaded channel 59 moulded thereon at a point well above the longitudinal median line and into which one of the rods 60 is inserted, the rods being fixedly emplaced in and through the side walls of said frame and intromittent through the cavities of said channels to allow blades a, b and c to freely swing thereon.

levis type brackets 61 attached at their bases by rivets to the lowermost parts of said blades have positioned between their bifurcate arm portions, a rod 62, to which said bifurcate arms are attached pivotally by clevis pins 63 at three equidistant points allowing for the vertical movement of said rod and the full closing of said blades to prevent entrance of outside air and, conversely, to provide a wide degree of are opening for said blades in order to allow the entry of desired quantities of outside air when it is required, each of the blades a, b and c of the combination, opening to the same degree when actuated by negative air pressure generated by a blower.

The lower third of the rod 62 has threads 64 turned thereon to provide means for an internally threaded nut 65 to be used for adjusting the degree of opening of the louver blade plurality, the nut being turned upwardly 'on said rod to decrease the permissive amount of opening that said plurality will be allowed to accomplish or being turned downwardly to increase the extent of louver opening, the nut making contact with the underside of the base 35 when the blade plurality is drawn to the opened position by negative air pressure with the rod 62 passing with limited tolerance through a hole drilled through said base.

In order to ensure that the louver blade plurality a, b and 0 may close securely by gravity a concavity 66 is formed on each blade with the concavities of blades a and b matching the convex surfaces of the hollow channels 59 of blades b and C respectively.

Operation'of the apparatus embodied in FIGS. 1 and 2 may be described as follows:

With the manual switch 3% closed and the mercury switches 36 and 3? in their closed positions due to lack of pressure within the boiler, electrical energy is'immcdiately transmitted through the closed mercury switch 36 to motor 16, to the transformer and ignition means connected to conduit 44, to terminal #1 of relay 46 and to the Nichrome type coil 47 connected between terminals #1 and #3 of said relay.

Upon motor 16 being energized it almost instantaneously reaches its full operational speed and rotates shaft 17, the blower wheel means 11 and 12 and the gears of the pumping means in the casing at 20. Oil is drawn respect to the rates of oil to be fired for combustion.

therein.

Oil in excess of that desired for combustion for a particular rate of firing is bypassed to the suction conduit 22, through conduit section 9, with valve 8 being fully opened at this time and valve fully closed. If oil is bypassed to the storage tank via conduit 23a, valve 25 would of course be opened to the desired extent to maintain pressure in conduit 23 at a predetermined rate while valve 8 would be in the closed position. Under certain conditions valve 8 could be used as a secondary means for regulating oil pressure but this feature is not contemplated in this disclosure.

Other methods of fuel regulation are possible but a brief description, included hereinafter, of how a fuel unit maintains oil flow at an exact rate and pressure, is believed ample for an understanding of this facet, insofar as it applies to the present concept.

Returning again to the description: When the motor 16 is energized the louver blade combination is actuated to the predetermined extent of its opened position by the negative air pressure generated by the rotating element of the blower means 11 as allowed by the setting of the nut 65a upon the threaded portion 64a of rod 62a, said rod being pulled vertically upwards by actuation of the louver blade combination and the nut making contact with the underside of base member at a fixed point on rod 62:: to provide a correct rate of air to support combustion of the fuel emitted from nozzle 27 for the low flame condition, the air being discharged under pressure from said blower through the blast tube 34 to the beforementioned firebox. At this same time the blade of the blower means at 12 is also rotated at maximum, constant speed by the shaft 17 but the louver combination 31 is effectively prevented from opening in response to induced air pressure generated by the rotation because of the application of latch 32 to the blades a, b and c of same, said latch being in application when actuator 33 is unenergized. This is the general condition of startup of the apparatus following any period after it has been completely shut down, and more particularly, it is better known as starting up under the low flame condition.

After a predetermined time interval the contact blade 48, in response to heatthrown off by the Nichrome type coil 47, completes its warping motion and makes connection across terminals #1 and #2 of relay 46. A circuit is established and electrical energy is immediately transmitted from terminal #2 through the closed mercury switch 37 to coil 53 of the solenoid operated, flow regulating valve 24 and to the louver actuator 33.

The solenoid operated, flow regulating valve being actuated, the normally opened passageway through same is closed while simultaneously, the normally closed passageway therethrough is opened. At this same moment the actuator 33 is energized and the latch 32 thereof is withdrawn from its holding position, allowing the louver blade combination 31 to immediately respond to the negative air pressure induced by the suction or vortex of the rotating blower element 12, said louver blade combination almost instantaneously swinging to its opened position as permissively allowed by the setting of nut 65 upon the threaded portion of rod 62.

Oil now flows through conduit 28 and the calibrated nozzle 29, and is emitted in a very fine spray therefrom. Oil discharged through nozzle 29 is at a higher rate than when it is discharged through nozzle 27 and the combined discharge air output of the blower elements 11 and 12 is at a rate to correspond with that necessary for a minimum excess of combustion air in accordance with the oil discharge rate of nozzle 29, said rate being determined exactly, according to the size of the firebox.

At this point it might be mentioned that various methods exist whereby the solenoid operated, flow regulating valve 24 could be delayed in, or prevented from opening its normally closed passageway until it had been ascertained by use of orthodox, automatic means that the louver blade combination 31 has been actuated to its opened position. Among the methods known are solenoid coil deceleration means to prevent the plunger of the solenoid valve from being actuated until said louver blade combination would have been opened and air supplied to the firebox at the rate desired for the high flame condition, or, by the use of an air operated switch which would withhold energization from coil 53 of said valve until it was automatically ascertained that the correct air rate had been provided.

After the high flame condition has been established it might be desirable in some instances to have the apparatus continue thereunder until a boiler pressure of maximum limit were reached, whereat the entire apparatus would shut down due to the mercury switch 36 being actuated by boiler steam pressure to its cut-out point.

Under such circumstance the function of the mercury switch 37 could be eliminated and the conduit bridged at this and other means used to assure a low flame startup. However, in most cases it would be desirable to have the apparatus start up under the low flame condition, go on to the high flame condition after a short time interval and then, after a desired intermediate boiler pressure had been reached, return to the low flame condition with no complete shut down of the appaaratus having occurred. Under this circumstance a boiler pressure could be maintained within very narrow set limits.

Let us say, for example that mercury switch 36 has a cut-out point of 10 psi. and a cut-in point of 9 psi. and all points below and that mercury switch 37 has a cut-out point of 8 psi. and a cut-in point of 7 psi. and all points below.

Following a complete shut down, and with the boiler cold, the apparatus would re-start under the low flame condition and, after a certain interval of time, say of thirty seconds, said apparatus would operate under the high flame condition and would continue thus until an 8 p.s.i. boiler pressure was reached, whereat mercury switch 37 would be actuated to its opened position. The solenoid operated flow regulating valve 24 would then become deenergized simultaneously with actuator 33 and each would revert to its normal condition of operation, with the latch 32 of the actuator 33 closing the louver blade combination 31. The apparatus would thus be restored to operation under the low flame condition.

Thereafter, according to the circumstances of operation including the actual rate of combustion for the low flame condition, the heat dissipation rate as related to whether the output of the system is used for comfort heating, a processing operation or the like, and various other factors, the apparatus would either continue to build up boiler pressure, although at a greatly decelerated rate, to the cut-out point of mercury switch 36 whereat it would be completely shut down, or, the said apparatus, would, under the low flame condition, cause the boiler pressure to be gradually diminished until the cutare-aces a in point of 7 p.s.i. of mercury switch 37 was again realized whereby the system would again be caused to opcrate under the high fiame condition. Under the last stated circumstance the steam pressure maintained would vary at most by a one pound differential or between 7 and 8 psi.

The operating condition last described other than continually maintaining the steam pressure within very narrow limits with beneficial results to be derived thereby insofar as processing is concerned, also conserves heat and fuel; provides a greater amount of useful heat per amount of fuel used, saves the wear and tear caused by constant recycling of the equipment, avoids the irregularities involved in such recycling with consequent derogatory results in the product produced and the necessary frequent replacement of parts such as refractories, relays, motors, boiler surfaces and other appurtenances destroyed rapidly by excessive contraction and expansion caused by wide variations in temperature when the apparatus makes numerous complete stops during the course of the working day.

The embodiment of FIG. 3 is a variation of the invention wherein an oil burner 7t) is shown which has two air discharge tubes 71 and '72 both of which feed air into a blast tube '73 which leads to a firebox.

A motor 74 has a shaft '75 extending outwardly from both ends and said shaft provides rotative power for a pump '76, a primary blower means 7'7 and an auxiliary blower means 78. The shaft has adjustably positioned therearound an air intake plate 79 for manual adjustment of the rate of incoming air to the suction side of the primary blower and a system of air intake louvers 80 for the auxiliary blower which open by centrifugal forces if allowed to do so by an actuator 81 which is responsive to electrical control means.

The primary air intake louver plate has an adjusting screw 82 byivhich the plate 79 is set to allow a fixed rate of air to enter the suction side of the primary blower means.

Various types of louver means other than the centrifugally or pneumatically operated, could be employed for either blower means, as could other types of actuator rather than the electrically responsive type used herein to achieve the intended result.

Air intake rate adjustment for the louvers 8t) of the auxiliary blower means is predetermined by the manually fixed setting of the arm 83.

Oil is drawn from the storage tank, indicated but not shown in the drawing, to the suction intake of the pump 76 through conduit 84 and is discharged from the pump under pressure through conduit 85 to a solenoid operated, fiow regulating valve 86 which is similar to the solenoid operated valve 24 previously described.

With the motor 74 running but without the solenoid valve 86 being electrically actuated, the oil discharged from the pump passes through the normally opened passageway of the valve into the oil conduit 557 and thence through the regulating valve 38 and into and through the nozzle line 859 to be emitted from the nozzle ?t as a fine spray.

As the regulating valve 38 is preset to pass a low rate of oil therethrough to be emitted into the firebox the rate of air necessary to properly support combustion of said low rate of oil is supplied in suflicient and exact degree with a minimum of excess by the primary blower means 77.

The air discharged by the blower means 77 passes through the air duct 72 and blast tube '73 and is blown into the firebox as the oil is emitted thereinto from the nozzle 9%. This constitutes the operation for the low flame condition. At this time the centrifugally operable louvers 8th of the auxiliary blower are held in the closed position by the plunger of the unenergized actuator 81.

.When the high flame condition is called for by a thermostat, aquastat or other suitable instrument, the solenoid operated valve 86 is energized and the normally opened passageway thereof is closed while its normally closed passa eway is simultaneously opened. Oil is then propelled by the pump 76 through the normally closed, but now opened passageway of the valve 86 and into and through conduit 91, through the regulating valve 92, which is adjusted to pass oil at a higher rate than is regulating valve 88, and thence into nozzle 99 from which it is emitted as a fine spray.

The actuator 81 is energized simultaneously with the solenoid operated valve 86 and the louver combination 15 i) is immediately opened to the full, preset extent through the centrifugal forces imposed by the energization of the motor 74 and rotation of shaft 75.

When the louver combination 86 is opened, air is indrawn into the eye or suction side of the blower means 78 and is discharged off the tips of the blower wheel under pressure into and through duct 71, thence into the blast tube 7.) where it is intermixed with air from blower 77, augmenting same and being discharged therewith from tube 73 into the firebox to provide an exact rate of air to support combustion of the oil emitted into the firebox at the high rate. It is almost needless to say that the high rate of fuel with the high rate of air to support combustion thereof is calculated according to the exact dimensions of the firebox to achieve the most efficient rate of combustion therein.

The transformer 93, changes line voltage and current to high voltage, low current electricity and high tension cables 94 carry this energy to metal igniters 95 to cause an intense electric spark to occur across the air gap of the igniter plurality. Porcelain sleeves cover all parts of the igniters except their forward ends to avoid short circuiting of the high voltage electricity to other parts of the burner complex. The transformer was omitted from the drawing in FIG. 1 but the transformer and ignition means to be used with that embodiment could be similar to those used in the embodiment of FIG. 3.

A bypass conduit 97 on the pump discharge side causes oil in excess of the rate required for firing to be returned to conduit 34. A regulating valve $3 is placed in said bypass conduit to provide means for precise control of oil pressure as oil is delivered to the nozzle.

Because the embodiments of FIGS. 1 and 3 are depicted diagrammatically, it was thought necessary to provide more definitive illustrations and explanations of louvers operatively responsive to applied centrifugal force means and, oil pressure regulating means, whereby oil may be maintained for firing purposes under pressures where variations are so minute that to all intents and purposes they are unnoticeable.

The centrifugally operated louver means depicted in FTGS. 4, 5 and 6 are taken after means well known in the art. The shaft 12% has a push rod P working in an axial socket and when centrifugal force is generated through rotation of the shaft a crosspiece N pushes forward in through a longitudinal diametric slot cut in the shaft at 0 against the rod P.

The outer end of the rod P bears against an arm of a bell-crank lever Q through which the application of force is continued in order to actuate louvers or valves to uncover the air intake openings.

For convenience to the description, said push rod P has been divided into two separated

sections

121 and 122 and said sections have been enclosed within a strong, compressible spring 123 which is slidable in the hollow section of the shaft.

One end of the said spring is positioned against a lug 124 formed on section 121 of said rod and the other end of the spring is positioned against a stop 125 formed on the rod section 122.

Positioned against the arm of the bell-crank Q is the plunger 1126 of an electrically operable actuator 127.

in PEG. 4 the components of shaft are shown in 9 the normal or unactua-ted position, there being no application of centrifugal force.

In FIG. the components are depicted under the application of centrifugal force but with the air intake louvers being unable to be actuated because plunger 126 of actuator 127 is in its normal holding position against the outermost end of section 122 of the push rod P. The innermost rod section 121 is however forced towards the outer rod section 122 against the counter pressure exerted by the spring 123, through centrifugal forces exerted on the crosspiece N.

In FIG. 6 the components are depicted as being under the application of centrifugal forces with the air intake louvers now having been freed to open by withdrawal of plunger 126 through energization of actuator 127. It will be noted that the inner rod section 121 of push rod P is in the same position in FIG. 6 as it was shown in FIG. 5 but the compression of the spring 123 in FIG. 5 is released in FIG. 6, with the compressive force of the spring transmitted instead to rod section 122 because of the plunger 126 having been withdrawn, therefor allowing said rod section 122 to move outwardly and absorbing the thrust of the spring thereby.

Referring to FIG. 7, the previously mentioned, diagrammatic representation of a fuel unit is included in the draw ings because such uni-ts are almost universally used as components of burners of the general type shown in FIGS. 1 and 3.

While many varieties of fuel unit exist it is thought that the unit schematically depicted in FIG. 7 is a fair representation of the many available.

As was previously remarked, the average fuel unit is very compact, has only one shaft means and is usually positioned because of its small size upon a sidewall of the burner frame.

In the drawing the suction conduit 9.2a extends between the oil storage tank (not shown) to a strainer element 140, positioned almost invariably on the intake or low pressure side of the fuel unit. From the strainer the oil is drawn through conduit 141 to the first stage or, the suction gear stage 142 of the pumping component, and from said first stage the oil is discharged through a conduit 143 into a so-called bypass body element 144 by the gears of said suction stage wherefrom it may leave by one of two exit ports, one of said ports 145 leading to passageway 146 which connects to the entrance port 147 of a second stage or discharge gear stage 148 of the pumping component. oil is discharged under pressure from said stage via a passageway 149 and into an element 150, said efement having incorporated therein various constituents of a pressure regulating means, the oil entering the element at chamber 151 wherein it is subjected to regulation of pressure by a needle valve 152 in association with a piston 153 having an orifice port 154 and an orifice passageway 155 drilled in and therethrough.

The piston is movably positioned within element 151) and is freely slidable therein despite very close tolerance between itself and the piston confining means of said element. A spring 156 is emplaced to oppose movement of the piston with one end of said spring having continuous contact with the upper surface of the piston and the other end having continuous contact with a plate 157. An adjusting screw 158 is placed in contact with said plate and said screw extends through the top exterior surface 159 of said element. The screw upon being turned inwardly against the plate causes greater compression of the spring 156 with resultant greater pressure of the oil delivered to the discharge oil conduit 23b.

The tip 160 of the needle valve is in vibrating contact with the orifice port 154 of the channel drilled through said piston and upon a fluctuation of oil pressure in chamber 151 said vibrating contact between the orifice .and needle valve tip is varied accordingly to maintain a precise rate of pressure of the oil discharged to conduit 23b which, in the embodiment of FIG. 1, would corre- 'spond to conduit 23 or in the embodiment of FIG. 3, would correspond to conduit 85.

Excess oil determined in extent by the pressure maintained in the chamber 151 by the setting of pressure regulating adjustment screw 158, travels through the channel of the piston to the upper part of the interior of the element 150 and is propelled therefrom into passageway 161, from which it is discharged into the bypass component from which it is either returned to the oil storage tank via conduit 23a which would correspond to conduit 23:: in the embodiment of FIG. 1 or, if conduit 9 of the embodiment of FIG. 1 were in use to return excess oil to suction conduit 22, then conduit 23a of the embodiment of FIG. 7 would correspond to said conduit 9. If the fuel unit of FIG. 7 were to replace pump 76 of the embodiment of FIG. 3 the bypassed oil would be returned to the suction conduit 34 depicted in the last said figure.

While it is manifest that numerous alterations could be made in the construction of the fuel unit proper, such as by changing the piston for a diaphragm, adding additional springs, shunting the bypassed oil to the strainer element or to the first stage gears rather than to the element 144, by using only a single stage of pumping gears, or additionally, by incorporating oil flow, cut-off means within the fuel unit as would be done in the usual case, it is believed nevertheless that the description and the illustration accompanying same is sufiicient to identify the correct nature of this precision instrument for maintaining exact pressures of fuel oil for combustion purposes.

In FIG. 8, oil cut-off means are shown positioned in an oil discharge line to a calibrated nozzle, illustrating schematically how after drip of oil from a nozzle may be prevented from occuring after rotation of the pumping gear means has ceased. It is evident that the device could be greatly improved and the drawing of same is included in the figures only to give a general idea of its purpose.

The body of the oil cut-off component 17%, may be considered as connected to any of the oil conduits heretofore mentioned, or illustrated in FIGS. 1, 3 and 7. An oil passage 171 extends within component from a said discharge conduit to an interior wall 172 thereof. A pressure plate 173 is slidable with very close tolerance within a chamber 174 formed within the component and said plate is part of a unitary piece which incorporates a valve element 175 and a valve stem 176. A permanently positioned pressure plate 177 has a cavity 173 formed therein in which the end of said valve stem is slidable. A spring 179 which is compressible at about 50 pounds p.s.i. encircles the valve stem with one end of said spring in engagement with the fixed plate 177 and the other end in engagement with the slidable plate 173.

An oil passageway 180 is drilled through the body of the component at 181, and said passageway is in communication with a calibrated nozzle 132, screwed to the anterior part thereof. When oil under pressure from the rotating gears of a pump oil passes through a said of thestem sliding in cavity 178 of plate 177. Under this circumstance the oil discharged from the pumping means flows through passageway 180 to the calibrated nozzle 182 from which it is emitted as a fine spray. Immediately upon cessation of pressure applied to the oil, the

spring with its expansive force of 50 p.s.i. closes off the passageway 181) by forcing the valve element 175 against same, thus preventing oil dripping from the nozzle.

Oil drip'from the nozzle is known in the trade as after drip and for a great many years many types and variations of types of oil cut-oil means have been avai able and the type diagrammatically illustrated is but indicative of the general purpose and application of same.

What I claim is:

1. A high flame, low flame oil burning system comprising two fans having unitary shaft means, air discharge duct means common to both fans, separate air intake means for each fan, said air intake means closing when said fans are at rest, automatic holding means applicable to the air intake means of one fan, releasing means for said holding means, the separate air intake means for one fan opening by negative air pressure when both fans are rotated unitarily and the separate air intake means for the other fan remaining closed by said holding means being applied thereto, a high rate of air supply occurring when said two fans are rotated unitarily on said shaft means and the separate air intake means for each fan is opened, a low rate of air supply occuring when said two fans are rotated unitarily on said shaft means and the separate air intake means for one fan is opened and the eparate air intake means for the other fan is closed, electric motor means applicable to said shaft means, an oil supply source, oil pumping means actuable by said electric motor and said shaft means, oil pressure regulating means associated with said pumping eans, oil conduit means extending from said oil supply source to the suction intake of said pumping means, an oil conduit means extending from the discharge outlet of said pumping means for the delivery of oil under pressure therefrom, solenoid operated iiow regulating valve means in last said oil conduit means, said regulating valve means comprising inlet passageway means for fuel oil, a plurality of outlet passageway means and closure means for each of said outlet passageways, electrically actuable operating means for said closure means, means mechanically interconnecting each of said closure means for simultaneous operation thereof, said closure means being associated with said outlet passageways to effect the opening of one passageway upon closure of another, oil discharge conduit means extend ng from each of the said plurality of outlet passageway means of said regulating valve means, oil ilow metering means in each of last said oil discharge conduit means, a first electrical control means individual to said electric motor, a second electrical control means common to said flow regulating valve means and said releasing means, said first electrical control means being responsive individually to a call for the low flame condition to energize said electric motor, and said first electrical control means and said second electrical control means being concurrently responsive to a call for the high flame condition, said first control means electrically actuating said electric motor and said second control means electrically actuating said closure means of said flow regulating valve means and electrically actuating said releasing means to effect the release of said air intake holding means.

2. A high flame, low flame oil burning system comprising two fans having unitary shaft means, air discharge means individual to each fan, air discharge duct means common to both fans, separate air intake means for each fan, said a r intake means closing when said fans are at rest, automatic holding means applicable to the air intake means or" one fan, releasing means for said holding means, the separate air intake means for one fan opening by negative air pressure when both fans are rotated unitarily and the separate air intake means for the other fan remaining closed by said holding means being applied thereto, said separate air intakemeans for the last said fan opening automatically when said holding means are not applied, a high rate of air supply occuring when said two fans are rotated unitarily on said shaft means and the separate air intake means for each fan are opened, the low rate of air supply occuring when said two fans are rotated unitarily on said shaft means and the separate air intake means for one fan'are opened and the separate air intake means for the other fan are closed, electric motor means applicable to said shaft means, an oil supply source, oil pumping means actuable by said electric motor and shaft means, oil pressure regulating means associated with said pumping means, oil conduit means extending from said oil supply source to the suction intake of said pumping means, oil conduit means extending from the discharge outlet of said pump for the delivery of oil under pressure therefrom, solenoid operated flow regulating valve means in last said conduit means, said solenoid operated flow regulating valve means comprising inlet passageway means for fuel oil, a plurality of outlet passageways, closure means for each of said outlet passageways, electrically actuable operatin means for said closure means, means mechanically interconnecting each of said closure means for the simultaneous operation thereof, said closure means being associated with said outlet passageways to elfect the opening of one passageway upon closure of another, oil discharge conduit means extending from each of the said plurality of outlet passageways of said re ulating valve means, oil flow metering means in each of last said oil discharge conduit means, a first electrical control means individual to said electric motor, a second electrical control means common to said solenoid operated flow regulating valve means and said releasing means, said first electrical control means being responsive individually to requirement for the low flame condition to energize said electric motor, and said first electrical control means and said second electricfl control means being concurrently responsive to a requirement for the high flame condition, said first control means electrically actuating said electric motor and said second control means electrically actuating said closure means of said solenoid operated flow regulating valve means and electrically actuating said releasing means to effect the release of said air intake holding means.

3. A high flame, low flame oil burning system comprising two fans having unitary shaft means, air discharge duct means common to both fans, separate air intake means for each fan, said air intake means closing when said fans are at rest, automatic holding means applicable to the air intake means of one fan, releasing means for said holding means, the separate air intake means for one fan opening when both fans are rotated unitarily and the separate air intake means for the other fan remaining closed by said holding means being applied thereto, said separate air intake means for the last said fan opening when said holding means are not applied, a high rate of air supply occurring when said two fans are rotated unitarily on said shaft means and the separate air intake means for each fan is opened, a low rate of air supply occurring when said two fans are rotated unitarily on said shaft means and the separate air intake means for one fan is opened and the separate air intake means for the other fan is closed, electric motor means applicable to said shaft means, an oil supply source, oil pumping means actuable by said electric motor and said shaft means, oil pressure regulating means associated with said pumping means, oil conduit means extending from said oil supply source to the suction intake of said pumping means, oil conduit means extending from the discharge outlet of said pumping means for the delivery of oil under pressure therefrom, flow regulating valve means in last said conduit means comprising inlet means for fuel oil, a pluralityof outlet passageways and closure means for each of said outletpassageways, electrically actuable operating means for said closure means, means mechanically interconnecting each of said closure means for simultaneous operation thereof, said closure means being associated with said outlet passageways to eifect the opening of one passageway upon closure of another, oil discharge conduit means extending from each ofthe said plurality of outlet passageways of I 13 said regulating valve means, oil flow metering means in each of said oil discharge conduit means, a first electrical control means individual to said electric motor, a

'second electrical control means common to said flow regulating valve means and said releasing means, said first electrical control means being responsive individ ually to a requirement for the low flame condition to energize said electric motor, and said first electrical control means and said second electrical control means being concurrently responsive to a requirement for the high flame condition, said first control means electrically actuating said electric motor and said second control means electrically actuating said closure means of said flow regulating Valve means and electrically actuating said releasing means to effect the release of said air intake holding means.

4. A system according to claim 3 including means re sponsive to centrifugal forces for opening the separate air intake means for each fan.

5. A system according to claim 3 including means responsive to centrifugal forces for opening the separate air intake means for a fan and with holding means applicable to said air intake means whereby centrifugal application of force may take place without effect for opening said air intake means until the application of said holding means is released.

prising two fans having unitary shaft means, air discharge duct means common to both fans, normally closed, separate air intake means for each fan, said air intake means closing when said fans come to rest, holding means for the separate air intake means of one fan, releasing means for said holding means, the separate air intake means for one fan opening when both fans are rotated unitarily and the separate air intake means for the other fan remaining closed because of said holding means being applied thereto, said separate air intake means for the last said fan opening when said holding means are not applied, a high volume of air delivered when said two fans are rotated unitarily on said shaft means and the separate air intake means for each fan is opened, a low volume of air delivered when said two fans are rotated unitarily on said shaft means and the separate air intake means for one fan is opened and the separate air intake means for the other fan is closed, an electric motor applicable to said shaft means, an oil supply source, oil pumping means actuable by said electric motor and said shaft means, oil pressure regulating means associated with said pumping means, oil conduit means extending from said oil supply source to the suction intake of said pumping means, oil conduit means extending from said pumping means for the delivery of oil under pressure therefrom, flow regulating valve means connected to last said conduit means comprising inlet means for fuel oil, a plurality of outlet means and closure means for each of said outlet means, electrically actuable operating means for said closure means, said closure means being associated with said outlet means to effect the opening of one of said outlet means upon closure of another, oil

discharge conduit means extending from each of the said plurality of outlet means of said regulating valve means, oil flow metering means in each of last said discharge conduit means, a first electrical control means individual to said electric motor, a second electrical control means common to said flo-w regulating valve means and said releasing means, said first electrical control means being responsive individually to a requirement for the low flame condition to energize said electric motor, and said first electrical control means and said second electrical control means being concurrently responsive to a requirement for the high flame condition, said first control means electrically actuating said electric motor and said second control means electrically actuating said closure means of 'said flow regulating valve means and electrically actuat- 14 ing said releasing to effect the release of said air intake holding means.

7. A system according to claim 6 including means responsive to centrifugal forces for opening the separate air intake means for each fan.

8. A system according to claim 6 including means responsive to centrifugal forces for opening the separate air intake means for a fan and with holding means applicable to said air intake means whereby centrifugal application of force may take place without effect for opening said air intake means until the application of said holding means is released.

9. A high volume, low volume air delivery system comprising a blower element plurality having unitary shaft means, automatic turning means for rotating said shaft means, air discharge duct means common to said blower element plurality, a first, separate, air intake means associated with a first blower element of said plurality, a

second, separate, air intake means associated with a second blower element of said plurality, each of said air intake means operable to open by the negative air pressure induced by the rotation of its respective, associated, blower element, each of said first air intake means and said second air intake means operable to close by gravity forces when the associated blower elements thereof come to rest, automatic holding means to prevent the opening of said first air intake means in response to the negative air pressure induced by its associated, rotating, blower element, automatic releasing means for said holding means, the high volume air delivery condition occuring when said blower element plurality is rotating on said shaft means and said first and said second air intake means are opened and said holding means are released from application by said releasing means, and the low volume air delivery condition occurring when said blower element plurality is rotating on said shaft means and said first, separate, air intake means associated with said first blower element is held in the closed position by said holding means to counteract the negative air pressure induced by said first blower element, said holding means not being released by said releasing means.

10. A high volume, low volume air delivery system comprising a blower element plurality having unitary shaft means, automatic turning means for rotating said shaft means, air discharge duct means common to said blower element plurality, a first, separate, air intake means associated with a first blower element of said plurality, a second, separate, air intake means associated with a second blower element of said plurality, each of said air intake means operable to open automatically when said automatic turning means are actuated, each of said air intake means operable to close automatically upon the cessation of actuation of said automatic turning means, automatic holding means to prevent the opening of said first air intake means when said automatic turning means are actu ated, automatic releasing means for said holding means, the high volume air delivery condition occurring when said blower element plurality is rotating on said shaft means and said first and said second air intake means are opened and said holding means are released from application by said releasing means, and the low volume air delivery condition occurringwhen said blower element plurality is rotating on said shaft means and said first, separate, air intake means associated with said first blower element is held in the closed position by said holding means to prevent said first, separate air intake means from opening automatically, said holding means not being released by said releasing means. I

11. A high volume, low volume air delivery system comprising a blower element plurality having unitary shaft means, electric motor means for rotating said shaft means, air discharge means individual to each blower element, a first, separate, air intake means associated with a first blower element of said plurality, a second, separate, air intake means" associated with a second blower element of said plurality, each of said air intake means operable to open automatically when said shaft means are rotated by said electric motor means, each of said air intake means operable to close automatically upon the cessation of r0- tation of said shaft means by said electric motor means, automatic holding means to prevent the opening of said first air intake means when said shaft means are rotated by said electric motor means, automatic releasing means for said holding means, the high volume air delivery condition occurring when said blower element plurality is rotated on said shaft means by said electric motor means and said first and said second air intake means are opened and said holding means are released from application by said releasing means, and the low volume air delivery condition occurring when said blower element plurality is rotated on said shaft means by said electric motor means and said first, separate, air intake means associated with said first blower element is held in the closed position to prevent said first, separate, air intake means from opening automatically, said holding means not being released by said releasing means.

12. A high volume, low volume air delivery system comprising a blower element plurality having unitary shaft means, electric motor means for rotating said shaft means, air discharge means individual to each blower element, a first, separate, normally closed, air intake means associated with a first blower element of said plurality, a second, separate, air intake means associated with a second blower element of said plurality, said first air intake means operable to open automatically upon requirement for the high volume air delivery condition, automatic holding means applicable to said first air intake means upon requirement for the low volume air delivery condition, releasing means for said holding means, the high volume air delivery condition occurring when said blower element plurality is rotated on said shaft means by said electric motor means and said first and said second air intake means are opened and said holding means are released from application by said releasing means, and said low volume air delivery condition occurring when said blower element plurality is rotated on said shaft means by said electric motor means and said second, separate, air intake means are open and said first, separate, air intake means are held closed by said automatic holding means applied thereto.

13. A system as defined in claim 11 in which the automatic opening of said air intake means is caused by the actuation of centrifugal forces generated by the rotation of said shaft means by said electric blower means.

14. A system as defined in claim ll including separating means for preventing any substantial quantity of discharge air frcm one blower element entering the air intake side of the other blower element.

15. A system as defined in claim 12 including separating means for preventing any substantial quantity of discharge air from one blower element entering the air intake side of the other blower element.

16. An air delivery system comprising a blower element plurality having unitary shaft means, discharge means individual to each blower element, normally closed air intake means individual to each blower element, said air intake means of each blower element operable to open automatically when its associated blower element is rotated on said sha't means, automatic holding means applicable to the air intake means associated with a said blower element, releasing mcans for said holding means,

and means for the automatic rotation of said shaft means.

17. An air delivery system comprising a blower element plurality havinc unitary shaft means, air discharge means individual to each blower element, normally closed air intake means individual to each blower ele mom, said air intake means of each blower element operable to open automatically whenits associated blower element is rotated on said shaft means, automatic holding means applicableto the air intake means associated with l6 a number less than the total of said blower clement plurality, releasing means for said holding means, and mea is for the automatic rotation of said shaft means.

18. An air delivery system comprising a blower element plurality having unitary shaft means, air discharge means individual to each blower element, normally closed air intake means individual to each blower element, said air intake means of each blower element operable to open by the centrifugal forces generated by the rotation of said shaft means, automatic holding means applicable to the air intake means associated with a number less than the total of said blower element plurality, automatic releasing means for said holding means, and means for the automatic rotation of said shaft means.

19. An air delivery system comprising a blower element plurality having unitary shaft means, air discharge means individual to each blower element, air discharge means common to the blower element plurality, normally closed air intake means associated with a number less than the total of said blower element plurality, said normally closed air intake means operable to open automatically upon the rotation of said shaft means, automatic holding means applicable to said normally closed air intake means to prevent the opening of same upon the rotation of said shaft means, automatic releasing means for said holding means, and electric motor means for the automatic rotation of said shaft means.

20. A high flame, low flame fuel burning system comprising a blower element plurality having unitary shaft means, an electric motor for rotating said shaft means, air discharge duct means common to the blower element plurality, a first, separate, normally closed air intake means associated with a first blower element of said plurality, a second, separate, air intake means associated with a second blower element of said plurality, each of said air intake means being open when a requirement is made for the high flame condition, automatic holding means applicable to the first air intake means, releasing m ans for said holding means, said first air intake means operable to be held in the closed position by said holding means when a requirement is made for the low flame condition upon a start-up of the fuel burning system or operable to be closed from the opened position by said holding means when a requirement is made for said system to revert to the low fiame condition from the high flame condition, fuel metering means synchronized with said blower element plurality whereby a high rate of fuel is delivered concurrently with a high rate of air and a low rate of fuel is delivered concurrently with a low rate of air, a first control means individual to said electric motor, a second control means common to said releasing means and said fuel metering means, said first control means being responsive individually to a requirement for too low flame condition to cause the electrical energization of said electric motor, and said fi st control means and said second control means being concurrently esponsive to a requirement for the high flame condition,

said first control means to cause the energization of said electric motor and said second control means to cause the actuation of said releasing means and said fuel metering means and thereby effecting release of said holding means from said first air intake means.

21. A system as defined in claim 20 in which said fuel metering means comprise valve means embracing a plurality of passageways wherethrough prior to actuation a lesser rate of fuel may flow and subsequent to actuation a greater rate of fuel may flow.

22. A system as defined in claim 20 in which said first, separate, normally closed air intake means are operable to be opened by the generation of centrifugal forces upon the electrical energization of said electric motor md the rotation thereby of said shaft means when said holding means are not in application.

23. A system as defined in claim 20 in which said fuel metering means comprise a solenoid operated, fiow regulating valve means having a single body, with a normally opened passageway therethrough and a normally closed passageway therethrough and closure means for each of said passageways, means mechanically interconnecting each of said closure means for the simultaneous operation thereof to effect the opening of one passageway upon the closure of another and calibration means in association with each of said passageways whereby one passageway, when opened, allows the flow therethrough of a greater rate of fuel, and the other passageway, when opened, allows the flow therethrough of a lesser rate of fuel.

24. A high flame, low flame fuel burning system comprising a blower element plurality having unitary shaft means, an electric motor for rotating said shaft means, air discharge means individual to each blower element, a first, separate, normally closed air intake means associated with a first blower element of said plurality, a second, separate, air intake means associated with a second blower element of said plurality, each of said air intake means being open when a requirement is made for the high flame condition, automatic holding means applicable to the first air intake means, releasing means for said holding means, said first air intake means operable to be held in the closed position by said holding means when a requirement is made for the low flame condition upon a start-up of the fuel burning system or operable to be closed from the opened position by said holding means when a requirement is made for said system to revert to the low flame condition from the high flame condition, fuel metering means synchronized with said blower element plurality whereby a high rate of fuel is delivered concurrently with a high rate of air and a low rate of fuel is delivered concurrently with a low rate of air, a first control means individual to said electric motor, a second control means common to said releasing means and said fuel metering means, said first control means being responsive individually to a requirement for the low flame condition to cause the electrical energization of said electric motor, and said first control means and said second control means being concurrently responsive to a requirement for the high flame condition, said first control means to cause the energization of said electric motor and said second control means to cause the actuation of said releasing means and said fuel metering means and thereby effecting release of said holding means from said first air effecting release of said holding means from said first air intake means.

25. A system as defined in claim 24 in which said fuel metering means comprise valve means embracing a plurality of passageways wherethrough prior to actuation a lesser rate of fuel may flow and subsequent to actuation a greater rate of fuel may flow.

26. A system as defined in claim 24 in which said fuel metering means comprise a solenoid operated, flow regulating valve means, having a single body, with a normally opened passageway therethrough and-a normally closed passageway therethrough and closure means for each of said passageways, means mechanically interconnecting each of said closure means for the simultaneous operation thereof to effect the opening of one passageway upon the closure of another and calibration means in association with each of said passageways whereby one passageway, when opened, allows the flow therethrough of a greater rate of fuel, and the other passageway, when opened, allows the flow therethrough of a lesser rate of fuel.

27. A system as defined in claim 24 having separating means for preventing any substantial quantity of discharge air from one blower element entering the intake air side of the other blower element.

28. A system as defined in claim 20 including separating means for preventing any substantial quantity of discharge air from one blower element entering the intake air side of the other blower element.

References Cited in the file of this patent UNITED STATES PATENTS 1,637,820 Hawkins Aug. 2, 1927 1,648,796 Albrecht Nov. 8, 1927 1,741,529 Marion Dec. 31, 1929 1,760,166 Page May 27, 1930 1,846,863 Hagen Feb. 23, 1932 2,937,697 Johnston May 24, 1960 FOREIGN PATENTS 85,914 Denmark June 21, 1958

Claims

1. A HIGH FLAME, LOW FLAME OIL BURNING SYSTEM COMPRISING TWO FANS HAVING UNITARY SHAFT MEANS, AIR DISCHARGE DUCT MEANS COMMON TO BOTH FANS, SEPARATE AIR INTAKE MEANS FOR EACH FAN, SAID AIR INTAKE MEANS CLOSING WHEN SAID FANS ARE AT REST, AUTOMATIC HOLDING MEANS APPLICABLE TO THE AIR INTAKE MEANS OF ONE FAN, RELEASING MEANS FOR SAID HOLDING MEANS, THE SEPARATE AIR INTAKE MEANS FOR ONE FAN OPENING BY NEGATIVE AIR PRESSURE WHEN BOTH FANS ARE ROTATED UNITARILY AND THE SEPARATE AIR INTAKE MEANS FOR THE OTHER FAN REMAINING CLOSED BY SAID HOLDING MEANS BEING APPLIED THERETO, A HIGH RATE OF AIR SUPPLY OCCURRING WHEN SAID TWO FANS ARE ROTATED UNITARILY ON SAID SHAFT MEANS AND THE SEPARATE AIR INTAKE MEANS FOR EACH FAN IS OPENED, A LOW RATE OF AIR SUPPLY OCCURING WHEN SAID TWO FANS ARE ROTATED UNITARILY ON SAID SHAFT MEANS AND THE SEPARATE AIR INTAKE MEANS FOR ONE FAN IS OPENED AND THE SEPARATE AIR INTAKE MEANS FOR THE OTHER FAN IS CLOSED, ELECTRIC MOTOR MEANS APPLICABLE TO SAID SHAFT MEANS, AN OIL SUPPLY SOURCE, OIL PUMPING MEANS ACTUABLE BY SAID ELECTRIC MOTOR AND SAID SHAFT MEANS, OIL PRESSURE REGULATING MEANS ASSOCIATED WITH SAID PUMPING MEANS, OIL CONDUIT MEANS EXTENDING FROM SAID OIL SUPPLY SOURCE TO THE SUCTION INTAKE OF SAID PUMPING MEANS, AN OIL CONDUIT MEANS EXTENDING FROM THE DISCHARGE OUTLET OF SAID PUMPING MEANS FOR THE DELIVERY OF OIL UNDER PRESSURE THEREFROM, SOLENOID OPERATED FLOW REGULATING VALVE MEANS IN LAST SAID OIL CONDUIT MEANS, SAID REGULATING VALVE MEANS COMPRISING INLET PASSAGEWAY MEANS FOR FUEL OIL, A PLURALITY OF OUTLET PASSAGEWAY MEANS AND CLOSURE MEANS FOR EACH OF SAID OUTLET PASSAGEWAYS, ELECTRICALLY ACTUABLE OPERATING MEANS FOR SAID CLOSURE MEANS, MEANS MECHANICALLY INTERCONNECTING EACH OF SAID CLOSURE MEANS FOR SIMULTANEOUS OPERATION THEREOF, SAID CLOSURE MEANS BEING ASSOCIATED WITH SAID OUTLET PASSAGEWAYS TO EFFECT THE OPENING OF ONE PASSAGEWAY UPON CLOSURE OF ANOTHER, OIL DISCHARGE CONDUIT MEANS EXTENDING FROM EACH OF THE SAID PLURALITY OF OUTLET PASSAGEWAY MEANS OF SAID REGULATING VALVE MEANS, OIL FLOW METERING MEANS IN EACH OF LAST SAID OIL DISCHARGE CONDUIT MEANS, A FIRST ELECTRICAL CONTROL MEANS INDIVIDUAL TO SAID ELECTRIC MOTOR, A SECOND ELECTRICAL CONTROL MEANS COMMON TO SAID FLOW REGULATING VALVE MEANS AND SAID RELEASING MEANS, SAID FIRST ELECTRICAL CONTROL MEANS BEING RESPONSIVE INDIVIDUALLY TO A CALL FOR THE LOW FLAME CONDITION TO ENERGIZE SAID ELECTRIC MOTOR, AND SAID FIRST ELECTRICAL CONTROL MEANS AND SAID SECOND ELECTRICAL CONTROL MEANS BEING CONCURRENTLY RESPONSIVE TO A CALL FOR THE HIGH FLAME CONDITION, SAID FIRST CONTROL MEANS ELECTRICALLY ACTUATING SAID ELECTRIC MOTOR AND SAID SECOND CONTROL MEANS ELECTRICALLY ACTUATING SAID CLOSURE MEANS OF SAID FLOW REGULATING VALVE MEANS AND ELECTRICALLY ACTUATING SAID RELEASING MEANS TO EFFECT THE RELEASE OF SAID AIR INTAKE HOLDING MEANS.

9. A HIGH VOLUME, LOW VOLUME AIR DELIVERY SYSTEM COMPRISING A BLOWER ELEMENT PLURALITY HAVING UNITARY SHAFT MEANS, AUTOMATIC TURNING MEANS FOR ROTATING SAID SHAFT MEANS, AIR DISCHARGE DUCT MEANS COMMON TO SAID BLOWER ELEMENT PLURALITY, A FIRST, SEPARATE, AIR INTAKE MEANS ASSOCIATED WITH A FIRST BLOWER ELEMENT OF SAID PLURALITY, A SECOND, SEPARATE, AIR INTAKE MEANS ASSOCIATED WITH A SECOND BLOWER ELEMENT OF SAID PLURALITY, EACH OF SAID AIR INTAKE MEANS OPERABLE TO OPEN BY THE NEGATIVE AIR PRESSURE INDUCED BY THE ROTATION OF ITS RESPECTIVE, ASSOCIATED, BLOWER ELEMENT, EACH OF SAID FIRST AIR INTAKE MEANS AND SAID SECOND AIR INTAKE MEANS OPERABLE TO CLOSE BY GRAVITY FORCES WHEN THE ASSOCIATED BLOWER ELEMENTS THEREOF COME TO REST, AUTOMATIC HOLDING MEANS TO PREVENT THE OPENING OF SAID FIRST AIR INTAKE MEANS IN RESPONSE TO THE NEGATIVE AIR PRESSURE INDUCED BY ITS ASSOCIATED, ROTATING, BLOWER ELEMENT, AUTOMATIC RELEASING MEANS FOR SAID HOLDING MEANS, THE HIGH VOLUME AIR DELIVERY CONDITION OCCURING WHEN SAID BLOWER ELEMENT PLURALITY IS ROTATING ON SAID SHAFT MEANS AND SAID FIRST AND SAID SECOND AIR INTAKE MEANS ARE OPENED AND SAID HOLDING MEANS ARE RELEASED FROM APPLICATION BY SAID RELEASING MEANS, AND THE LOW VOLUME AIR DELIVERY CONDITION OCCURRING WHEN SAID BLOWER ELEMENT PLURALITY IS ROTATING ON SAID SHAFT MEANS AND SAID FIRST, SEPARATE, AIR INTAKE MEANS ASSOCIATED WITH SAID FIRST BLOWER ELEMENT IS HELD IN THE CLOSED POSITION BY SAID HOLDING MEANS TO COUNTERACT THE NEGATIVE AIR PRESSURE INDUCED BY SAID FIRST BLOWER ELEMENT, SAID HOLDING MEANS NOT BEING RELEASED BY SAID RELEASING MEANS.